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https://issues.apache.org/jira/browse/HBASE-18002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16074183#comment-16074183
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Anoop Sam John commented on HBASE-18002:
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Ya if the after a restart, the region is not coming back to same RS, those
blocks belonging to this region is not usable. I have seen some jira raised
which discuss abt making regions come back to original RS as much as possible.
This helps wrt HDFS locality also. Dont know which one.. May be we should
check possibility for that.
But we can not delete file on restart. Otherwise we have to remove the concept
of persistence in IOEngine.
> Investigate why bucket cache filling up in file mode in an exisitng file is
> slower
> -----------------------------------------------------------------------------------
>
> Key: HBASE-18002
> URL: https://issues.apache.org/jira/browse/HBASE-18002
> Project: HBase
> Issue Type: Sub-task
> Components: BucketCache
> Affects Versions: 2.0.0
> Reporter: ramkrishna.s.vasudevan
> Assignee: ramkrishna.s.vasudevan
> Fix For: 2.0.0
>
> Attachments: HBASE-18002.patch
>
>
> This issue was observed when we recently did some tests with SSD based bucket
> cache. Similar thing was also reported by @stack and [~danielpol] while doing
> some of these bucket cache related testing.
> When we try to preload a bucket cache (in file mode) with a new file the
> bucket cache fills up quite faster and there not much 'failedBlockAdditions'.
> But when the same bucket cache is filled up with a preexisitng file ( that
> had already some entries filled up) this time it has more
> 'failedBlockAdditions' and the cache does not fill up faster. Investigate why
> this happens.
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